TW201215006A - Combined open loop/closed loop method for controlling uplink power of a mobile station - Google Patents

Abstract

A method and apparatus are disclosed comprising a combined open loop/closed loop uplink power control scheme for E-UTRA. The combined open and closed loop method for UL intra-cell PC controls the wireless transmit receive unit (WTRU) transmit power spectral density (PSD), PSDTx, (e.g. power per RB).

Description

201215006 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a wireless communication system. [Prior Art] There are many Transmission Power Control (Tpc) proposals for Evolved Universal Terrestrial Radio Access (E_UTRA) Uplink (UL)' to be delivered to the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) Working Group丨 (WG1). These proposals are usually divided into (slow) open loop TPC and slow closed loop or channel quality information (CQI) based TPC. The open loop TPC is based on path loss measurements and system parameters, where the path loss is measured in the Record/No Cell (WTRU) money line and the system parameters are provided by the Evolved Node B (eNodeB). . The closed loop tpc is typically based on Tpc =feed information' (such as TPC commands) sent periodically from eN〇deB, where the backhaul is typically obtained using the Signal Interference Arm Ratio (SINR) measured at e odeB. / 碣 morning TPC can compensate for long-term channel changes (such as path loss and yin) 'for example, 'in an effective way, do not need to transmit power to remember 'TPC TPC typically guides her error and transmission r two sets error. On the other hand, because based on the feedback sent by the eNodeB = slow speed, the CQI-based TPC is less sensitive to measurement and transmission power. However, slow performance or slow performance based on CQI@Tpc is reduced when the transmission is interrupted or the box, the first micro-transmission interrupts the ea^ frequency, and the stagnation is not heavy and there is no feedback available. For UL E-UTRA's many cell deduction proposals have been delivered to 3 201215006 Third Age Partner Program (5) pp) Long Term Evolution (LTE) Working Group (WG) #卜 These mentions often can be slow Lai ring pc And slow loop (or CQI based PC). The open loop Pc can compensate for long-term channel changes (for example, the path is down), such as the post-mortem mode, there is no need to transmit God's ride, but it is measured by the thief and the transmission power setting duck difference. On the other hand, the slow-relief or the based-based pc is less sensitive to the error of measuring f and transmitting the trousers because it is based on the feedback signal sent by eN〇deB. However, performance is degraded when there is no feedback available due to UM dedicated interrupts, or feedback transmission interruptions. [发=Γ Improved transmission power control method. The present invention discloses a method and apparatus for E_UTRA that includes a combined open loop/closed loop uplink power control scheme. The open loop method for 'and' in the cell controls the power read density (PSD) PSDTx (e.g., power per RB) of the wireless transmit receive unit (WTRU). [Embodiment] As mentioned below, the term "wireless transmitting/receiving unit (WTRU), $ but not = 者 赖 (UE), line _, fixed or mobile use of early search, mobile phone, Personal digital assistant (pDA), computer, any __user device that is running in a state without _. At the time 'surgery 5^ base station' includes but not limited to node B, network installed two! I, access Point (AP) or any other type of peripheral that runs in a scale environment. Figure 1 shows an example wireless communication network (NW), which includes a WTRU 20, one or more Node Bs, and one or more cells. Each cell 4A contains one or more nodes 6 (single or e-cell) 3'' and the node B 30 & includes a transceiver 12 that is configured to implement the disclosed transmission power control (=C) method. "Milk 2" includes a transceiver 11 that is also configured to implement the disclosed TPC method. Figure 2 is a functional block diagram of a transceiver no, 120 configured to perform the disclosed method. In addition to the elements included in a typical transmitter/receiver, i.e., WTRU or node b, 'transceivers 11', 12 includes processors 115, 125, receivers 116, 126 that communicate with processor ι15' ΐ 25, and The transmitters 117, 127 of the 5 115 '125 communication and the antennas 118, 128 that communicate with the receiver II6 I26 and the transmitters I! 7, U7 to facilitate wireless data transmission and reception. Moreover, receiver 126, transmitter 127, and antenna 128 can be a single receiver, transmitter, and antenna, or can include separate feeders, singers, and antennas, respectively. The transmitter ιι can be located in the WTRU or multiple transmit circuits 11 〇 can be located at the base station. Receiver 120 can be located at the WTRU or Node B or both at wru and Node B. The disclosed method of tpc includes a combined open loop closed loop scheme for power control within the uplink (UL) cell. The method includes controlling a WTRU transmission power spectral density (PSD) or PSD transmission (PSDtx) for a UL data channel control channel and a sound reference symbol (SRS), such as power per resource block (10) ' or using open loop and periodicity Closed loop power control (pc) WI^RU transmission power. If ulM(:s/ authorized representative receives the money interference noise ratio (SINR) at _B, then the channel is used in the WTRU. 201215006

"CQI" (or modulation code set (M board is open loop and / or measurement error. If there is no CQI available, only Lt is open loop. For closed loop components, bribe command signaling can be made, for example, No

^Overhead. Alternatively, the _ component can be signaled in the D command. Moreover, the disclosed method can poorly achieve good performance. As mentioned above, "丨, the public village contains (four) wtru transmission work = (10)) or PSD transmission (PSDtx), for example, per block '= or transmission power 1 when it is noted that although the disclosed method includes controlling the transmission PSD, it is equivalent to Control transmission power. PSDtx is defined as: PSDr^PSDopen+a-Ad〇sed+AMcs . (1) where (4) 11 represents the open-loop PSD based on the service loss expressed in ;; △_ is based on the power correction factor of the closed-loop component comparison, Described in detail below; is the discriminative offset of each-authorized (10); α is a weighting factor that is valid (α=ι) or invalid (a=G) according to the downlink (DL) control __ secretable loop component, It is embedded in the _PC (correction) command U (explicit or implicit). The weighting factor can be compared by the presence of the self-checking lake ring PC command skew. You can use the command from the eNodeB 30 || The high (4) signaling presence location informs the WTRU 20 that the transmission PSD should not exceed the maximum transmission pSD psD leg, which causes the PSDmax to be obtained based on the maximum allowed power p, the maximum allowed power being dependent on the UE power level, eg, pSDmax = IWM, where m is The number of resource blocks that are valid for a given subframe Indicates the size of the channel resource allocation. 201215006 The intra-cell pc scheme proposed in equation (1) can use an absolute power correction factor compared to the open-loop based PSD. According to equation (1), at the nth update The WTRUTxPSD at the moment can be expressed as: psdtm = psd» a + (8) - psd > ~ ^ do ^ ^ where (2) where U represents the (n-1)th TxPSD of the power offset of the MCS that does not include the parent-grant, Given by qing: ^ 卜 (4) 卜 (4). Typically, both the WTRU and the eNodeB are aware of the power offset for a single authorized MCS. The processing benefit of the WTRU 20 is combined with open-loop and closed-loop PCs based on path loss. To determine PSDtx, in accordance with the disclosed method, WTRU 20 first performs an open loop pc (psD, eg) based on path loss measurements and system parameters. PSD〇pen is calculated as follows: PSDopen = PsDl^+l (dBm); Equation (3) Where 'PSDt_ is the target psD received at the serving eN〇deB 3〇, which is preferably a dedicated parameter of the WTRU (or a subgroup of the WTRU). The target psd may be based on (4) quality ((10)) (eg target Block error rate (BLER) is adjusted by the outer loop mechanism, or it can be a path loss Compensating for part of the path loss. The signaling of the target is performed according to the slow-based adjustment via the slave B 3〇 to w; and 201215006 • especially from the serving eNodeB 30 to the WTRU 20 The filtered path loss in dB, including shadow fading, where the WTRU 20 first measures the instantaneous path loss based on a DL reference signal (RS) of known transmission power. The WTRTJ 20 then applies the filtering method to the path loss. For example, the filtered path loss at the kth time, L, can be calculated as: ^=ρ·Ιμ+(ι-ρ).^ ; where (4) where Α represents the time at (k-丨) Filtered path loss and immediate path loss at the kth time; p is the filter coefficient, 0 < ρ < 1 , determined by the WTRU 20 'depending on, for example, path loss variation, fast fading rate, UL transmission time and other. Path loss filtering can be done at the physical (PHY) layer and/or at the l 2/3 layer. Once the WTRU 20 determines the open loop component, the processor u5 calculates the closed loop component. As is known to those skilled in the art, the presence of open-loop related errors' includes the absence of a complete inter-layer loss path estimation error and the Tx impairment due to the hybrid power amplifier A in the UL and DL of the FDD. In order to compensate for such an error to maintain the power of the target channel (fourth), the WTRU applies the correction to the open-loop based PSD in the form of a closed-loop PC as in equation (1) (fu (2)).

The serving eNodeB 30 is a WTRU-specific (absolute and/or ^) PC correction command for each UL scheduled WXRU (subgroup of bite U). Preferably, eN〇deB 30 uses power as a reference for the correction command. The resulting correction command informs the WTRU/0 (the WTRu S 201215006 group of Lai Cai) by using the sink grant and/or D channel sent by the Layer 1 or Layer 2 control channel. The correction command is only signaled in the no-correction process, for example, the authorization command associated with each HARQ process 1. When the correction command is received at wtru 2〇, the processor such as 2〇 determines the correction factor Δctoi based on the proposed correction command (or accumulated correction command): chsed = f (PC correction command, s)) * , (5), , can use - a multi-step value of the group, for example, using { +/- 4, + / _1 dB } of the 3-bit command. Alternatively, the eNodeB 30 uses multiple command bits in the UL grant and possibly in the DL scheduling of the DL control channel, eg, 3 bits to transmit power to each scheduled WTRU 20 (or a subgroup of scheduled WTRUs) Correction factor 'where the correction command is preferably determined based on the link quality of the power controlled data channel (such as the received PSD or SINR) (and possible UL sound reference symbols 'if available). For example, suppose a set of power correction factor values are {-7, +/- 5, +/- 3, +/- l, 〇 dB} with 3 bits, and the correction factor can be determined as follows Λ closed 'es, - SINRlarget (6) where, and the effective SINR (ESINR) estimate and the target siNR of the receiver representing the power controlled channel in dB, respectively. W represents the correction value closest to X in the correction set, which is closest to X. The samples used for the measurement of the ESINR estimate at the eNodeB include the (partial or full) SC_FDMA symbols of the UL Power Controlled Channel, which have been received since the last corrected command signalling in the DL. In order to reduce the command signaling overhead, there is no need to have a correction command in each UL grant (and as used in 201215006, in each DL schedule). That is, the correction command can be sent at a pre-configured signaling time (e.g., every N authorized channels or every N transmission time intervals (TTIs), where N is a configurable parameter that is less than or equal to the minimum ULPC update period). Based on the parent WTRU, the eX〇deB 30 (or at the RRC level) S sets the correction command signaling timing, so that at eN〇 (jeB and WTRU2〇 are known via higher layer signaling. When the correction command is in the UL grant When signaled, assuming ul HARQ ;!: synchronized, the signaling timing configuration can be simplified to enable command signaling in a special IJL authorization, such as a UL grant associated with a predefined process, such as harq process# Executed in 1. However, even in this case, there is no need to signal correction commands in all relevant melon grant channels. For example, 'signaling can occur in every N _ authorized channels, N>=1 'This is equivalent to having a command k command per N HARQ loop cycles. 彳§ Let timing (or related parameters) be reconfigured at a semi-static rate. ~ Figure 3 shows when the pc correction command is in An example of the % method disclosed when the process #1 is associated with the UL grant and N is set to 2. In this example, the pc update rate is 8 milliseconds, assuming that the number of q processes is 4' and the interval is transmitted. The time interval (TTI) is equal to 1. When the WTRU 20 has received a correction command (or a cumulative correction command in multiple melon authorizations) from the service spear e eNodeB 3〇 since the last Tx PSD adjustment, it will be from the received correction command (or If more than one command is received, multiple correction commands are combined) to obtain 201215006 to the correction factor for the next PSD adjustment.

The WTRU 20 then uses the resulting correction factor, the most recent open loop psD, and the power offset associated with the authorized MCS to adjust the data channel feed PSD according to equation (丨) (or equation (2)). The ps psD as the wire will be applied to the beginning of the next UL TTI used as the data channel (the first WFDMA symbol) and will remain unchanged until the next PSD adjustment, as shown in Figure 3. Figure 4 shows an example of the timing of the disclosed combined Pc method, assuming UL HARQ is a synchronization scheme with 4 harq processes, and the WTRU 20 is scheduled to transmit at each TTI (e.g., spaced TTM) - a data packet (eg a HARQ process). In addition, eN〇deB 3〇 sends a pc correction command in the UL grant associated with HARQ Process 1. In this case, the WTRU Tx power update period is 4 TTIs (e.g., 4 milliseconds). As shown in Fig. 4, in the initial ul transmission, since no PC correction command is available, the WTRU 20 sets its transmission power based only on the open-loop component (that is, the weighting factor a in equation (1) is zero). Before the next transmission time (- harq loop _), the eN() deB 3G sends a correction command in the authorized channel in the DL control channel associated with the process 1 process, wherein the command is based on the link of the first two HARQ processes f (power or SINR) is correct. If the WTRU 20 correctly receives the correction command, WTRU2 then calculates its transmit PSDtx based on the combined open loop and closed loop scheme and applies PSDTX to the subsequent harq process. Figure 5 illustrates another example of the 20120016 example of the disclosed combined pc timing, where the interval has a TTI of two. In this case, the ULPC update period is 8 TTIs (8 milliseconds). When there is no recent closed loop correction command (e.g., because of newly scheduled data transmission, i.e., UL DTX), the WTRU 20 can set its Tx PSD by relying on open loop. In this case, the weighting factor α in the equation (1) is set to 〇 as in the initial TxPSD setting. Alternatively, the WTRU 20 may set the Τχ PSD based on the path loss change between the time before DTX and the time before the grayed-out UL transmission. If the UL DTX is very short, the WTRU can use the formula (2) by setting α to 〇, so PSDTx („) = PSDTX (»-!) + (PSDope„ (η) - PSDopen (η -1)) + Awsc ( „) Equation (γ ) where η is the TxPSD set time before the UL transmission is restored, and (n−j ) is the PSD setting time before DTX. The timing example in this case is shown in Fig. 6. In the alternative, the WTRU 20 may apply a power offset relative to the latest PSD to the Physical Uplink Control Channel (PUCCH), if available. Even without UL data transmission, there are UL control commands for the DL (such as CQI and ACK/NACK). In this case, since the channel is also based on the power control of equation (1)' (but using different parameters and update speed), the UL control channel Tx PSD for the data channel Tx PSD can be used as follows: PSDTx (data) = PSDTx {control) + AcolUrol (data, control) Equation (8) where is the latest pSD of the UL control channel (or the average PSD in the recent update), ^control stands for 201215006

Tx PSD related control channel power offset. If the DTX period is very long then the PSDTX of the WTRU 20 may be determined based on the open loop only after DTX as is the case with the initial PSDTX setting. Figure 7 shows an example of a proposed combined pc scheme, including DTX. Typically, UL grant assignments (e.g., assigned MCS and TBS) in the DL Control Channel are closely related to the link quality of the UL data transmission (such as received PSD or SINR). Another method is disclosed in which

The eNodeB 30 processor 125 may assign a UL grant (MCS and TBS) to the WTRU 20 to cause the grant to assign a link quality (e.g., SINR) received at the eNodeB 30. In this case, the WTRU 20 may obtain its Tx PSD as follows: PSDTx = PSDopen + a-f (UL nm^m, SINRT) + (dBm); Equation (9) where ^u, ", and respectively are the same as defined above. / Calling the authorization assignment, is the correction factor indicated by the penalty, which replaces the power correction factor Δ1 in equation (1). 57A^r is the target of the crime. The authorization-based correction factor/single authorization assignment, S/AR) can be expressed as follows: / (see authorization assignment, S/JV7;) = - male mail (see authorization distribution)}; formula (i〇) where · sigh Authorization Assignment) indicates the SINR estimate obtained by the WTRU 20 received by the eNodeB from the UL grant allocation. Wuyi (10) represents the time average of the estimated SINR, for example

E {SINResl (grantk )} = pE {SINResl (grantk^ )} + (!-/>)· E{SINResl (gra^} J 13 201215006 Equation (11) where 〆 denotes the kth received UL grant assignment , p is the homogenization data coefficient 'o^i. The WTRU's iut/i authorization allocation) can be estimated based on: authorization (MCS 'TBS) mapping, which can be based on high-level signaling on a half (four) basis Road configuration. Similar to equation (1), the correction factor in equation (8) can be used to compensate for the open loop error. The main advantage of using equation (8) is that no explicit correction command signaling (resulting in reduced signaling overhead) is required in the UL grant of the ^1^ U/L2 control channel, while equation (1) (and equation (2) )) Display commands to be sent in ul authorization (and / or DL scheduling). Using equation (3), the closed-loop component can be based on UL grant assignments (e.g., MCS and/or TBS) without explicit correction command signaling in the UL grant of the DL L1/L2 control channel. However, Equation (9) cannot be applied in some cases where the persistent scheduling and authorization (e.g., MCS) mismatch (i.e., the assigned MCS does not correctly represent the received sinr). Therefore, the WTRU TxPSD setting can be switched between equations (1) and (8). The high-level correction factor type signaling, in which the eNodeB 30 (or the network 10) signals to the WTRU 20 which formula (Eq. (1) or (8)) is used for the WTRUTx power setting. In this case, the preferred correction factor type signal can be configured by the network 10 on a semi-static basis and on a per WTRU basis. Alternatively, a 1-bit MCS mismatch indicator can be introduced into the DLL 1/2 control signaling. For example, bit 1 can be used to indicate the use of equation (1), and bit 0 can be used to indicate equation (8). 201215006 In another alternative, one of the display correction command levels can be used to indicate the formula of equation (8). This lay-up hypothesis (1) is a silent PC method. Similarly, the eNodeB 30 sets one of the correction command levels in the UL grant to indicate the use of equation (8). For example, when the correction command in equation (8) is 3 bits long, one of 8 command levels is set for the WTRU 20, e.g., 〇〇〇, to use equation (8). The 8th ® shows the open combination of the TPC _ ring and closed loop side, , the target power spectral density pSK step _ . Based on the path loss α) (step 8〇1), the processor of wtr(10) performs open loop power control based on the roll loss measurement. Then 1 Qing 2〇 The power control correction received by the ^ authorized channel confirms _ _ 1 (step 8G2). - Wei Shunzheng ordered _. Connected to tender (steps of the power transfer (step (four) ^ flap amount combined to determine the transmission in the foreseeable poor materials (such as v〇Ip, wtRU has a variety of county settings its τχ coffee ^, method kidney UL # depicted HB in Specific time (instant) transmission see needle UL _ transmission secret =) pass UL authorization ( (and / or correction life private kind N / brother, same; _) If available: the second PUCCHf near update order average PSD The power pseudo-shift is applied to 201215006 (9) where A is a cell-specific parameter (in dBm) including the UL interference level, etc., which is signaled by the eNodeB via higher layer signaling. • SINRTarget* WTRU (or a subset of the WTRU) The dedicated parameter (indicated by the guilty) allows the eNodeB to set the service level for the UE (or a subset of ue). For the serving cell and some neighboring cells, it can be a function of path loss. Configured on a static basis and then sent to the certificate (or a subset of the top) via higher layer signaling; • pz is the downlink path loss (in dB); • is the cell-specific path loss for partial power control Compensation factor, where 〇<«<=1. "Can be used by eNodeB Configured on a semi-static basis and sent via high-level signaling; • A~^dB shirt (four) rate correction is determined by 'the secret duck mechanism'; • 〇c is the weighting of the _ component valid (~) or invalid ((four)) The factor, dependent on the availability of the DL control channel of the fine ring correction command. This weighting factor is automatically determined from the WTRu by detecting the presence of the pc correction command. It is assumed that the WTRU is informed of the location of the command signaling presence via higher layer signaling from the eNodeB. For example, in the initial sinking round, WTRu sets one because there is no correctable command from the eNodeB; • Δ(10) is the power offset of each authorized MCS. Typically, both fine and eNodeB are known to be single. The power offset of the authorized Mcs. 16 201215006 Since eNodeB 30 is known to use ^(10) in a given situation, when it passes the PSD (or SINR) received as a result, it is determined by the network 1(); When determining the correction command, eN〇deB 3〇 can obtain the value obtained from the PSD. As described above, this disclosed method uses an absolute power correction factor compared to an open-loop based PSD. 12), the WTRUTxPSD in the nth update case is expressed as follows: PSDTx (n) = pSD〇pen (n) + a- AcW (η) + ΔΜα („) Equation (13) where />young; 1) indicates that the (n-1)th TxPSD of the power offset of each authorized MCS is given by the >-1) = because the total WTRU transmission power is represented by the WTRU denoted as ? The maximum transmission power level limit, then the total WTRU transmission power represented by A, expressed as: =min{Pmax, (l〇.i〇g1〇(M) + PSDrj} (dBm); where (14) Is the number of allocated RBs. Therefore, the actual WTRU transmission PSD can be expressed as: PSD^01 = ΡΤχ -ΐ〇.l〇g]〇(Af) (dBm); Equation (15) It should be noted that the UL PC in equation (15) is used by the WTRU 20 The processor 115 is implemented. Based on the disclosed PC method for irregular data, the WTRU 20 calculates the open-loop PSD as follows: PSDopen = p0+siNRTateei+λ-pl (dBm) i Equation (16) 17 s; 201215006 where • Target SINR 's toilet rarge, The service eNodeB 30 can be adjusted according to quality of service (QoS) (eg, the target BLHO is adjusted by the outer loop mechanism, and can also be a function of path loss measurement for the serving cell and neighboring cells; and • the slave is expressed in dB The filtered path loss of the serving eNodeB to the WTRU includes shadow fading. The WTRU continuously (or periodically) measures the instantaneous path loss based on the DL RS, the WTRU knows the transmission power of the DL RS. The filtering method is then applied to the path loss Measurement, for example, PLk = p·PLk_x + (1 - p). ρι^ where (^?) where /^ and 凡^ represent the filtered path loss at the kth and (^)th times, respectively. The instantaneous path loss at time k. p is the filter coefficient, 'which is typically determined by the WTRU 20, depending on path loss variation, fast fading rate, UL transmission time, etc. Alternatively, a mobile equalization method can be considered for Path loss filtering. The above disclosure is similar, the closed-loop component is determined by the processor 115. = Bu, et al. (18) where the U port 'mail, respectively, represents the power-controlled channel in dB, the receiver's New SINR (ESmR) material And the target smR. M represents a correction value in the correction set, which is the closest; C. Similar to the method disclosed above, when the λ authorization towel is sent to the correction "Ρ令, it is assumed that the UL HARQ is synchronous, Simplify the signaling time configuration so that the L-order is executed in a UL grant associated with a particular UL grant, such as the predefined harq process 201215006. For reckless data (eg, VQIp), when there is no recent closed-loop correction command (eg ' Because of the recently scheduled UL data transmission, ie, ULDX), the WTRU 20 can set its Tx PSD by relying on open loop: in this case the weighting factor in equation (13):: as the initial Tx PSD setting; That is set to 0. The WTRU 20 may alternatively set its τ χ PSD based on the path loss change between the time before DTX and the time before the restoration of the UL transmission. If the DTX is short, the WTRU may use the method by setting ^ to 〇. 2), thus TMr>) = PlSZ^(w-1)+(pl(")-Qing-(«-l)) + 's(8); Equation (19) where η is the Τχ pSD setting before restoring UL transmission The time, (nq) is the pSD setting time before DTX. Fig. 4 shows an example of this case. Alternatively, the WTRU 20 may apply a power offset relative to the most recent PSD to the PUCCH, if available. There is no ul data transmission in real time, and there may be UL control signaling (such as CQI and ACK/NACK) for DL. In this case 'because the ul control channel (pucCH) is also based on equation (12) power controlled (but with different parameters and update speed) 'UL Control Channel (PUCCH) TxPSD can be used for data channels as follows ( PUSCH) TxPSD: PSDTx(PUSCH) = PSDTx {PUCCH) + AOTn<ro/ (PUSCH, PUCCH); Equation (20) where J/WC/O is the nearest PSD for the UL Control Channel (PUCCH) (or The average of the PSD on the recent update, uPL/sc// /)t/cc//) indicates that the control channel (PUCCH) power of the TxPSD with respect to the PUSCH is shifted by 201215006. For a sound pilot, its Tx PSD (four) 〇〇 can be offset by a pilot power offset relative to the data TXPSD, thus {pilot) = PSDTx {data) + Apjl〇l (data, pilot) where (21) where ( As indicated by the pilot power offset, which may be a WTRU-specific parameter configured on a semi-static basis by eN〇deB. Control signaling for UL_ preferably uses different parameters (such as target PSD) and relative data Faster update speed. In addition, we prefer that the reference channel measured for the correction command for the control command is the control frequency C itself' and the correction command for control is transmitted in the D1 schedule. The correction command for control The number of bits can be different from that used for the data, so the number of command bits can be an as-cast configurable parameter per WTRU base. However, we can maintain a relative average power offset between the data and control channels. For example, five (household *^ (such as α)) = £·(/>5Ζ)7:ϊ (co„/)) + △—such as gamma, (7)” (4)) Formula (22) where PSD ; * indicates The average *b/^A^c^^)) for data channels expressed in dBm is expressed in dBm They are in controlling the PSD; and, "Bian * △ _» __ /) is the power offset between the data channel and control channel. In another disclosed ULPC method, a combined open loop/closed loop UL pc with interference rejection for a shared data channel is used. According to this method, the 2012 WTRU 2 WTRU controls its transmission for the ul channel.

PSD. If the WAN 20's ▼ wide allocation (e.g., Rg allocation) changes, then the total transmission power also changes to keep the PSD unchanged. As described in the method disclosed above, the WTRU 20 performs an open loop Pc based on path loss measurements and system parameters. The WTRU 2 then corrects its PSD_gamma error using the form of some closed loop P-C. It should be noted that for each UL scheduled wtru, an i-notification CQI message is periodically sent from eN〇deB 3〇 for ajmc and scheduling. Thus, the closed-loop PC component of the method of the present disclosure does not require any additional pc commands sent by the eNodeB. In order to suppress inter-cell interference in adjacent cells, wtru 2〇 combines interference load indicators from the strongest neighboring cells in the future. According to the method, for the UL shared data channel, the WTRU 20 obtains its transmitted PSD PSDtx based on the DL reference signal (RS) in the initial transmission phase as follows: PSDTx = SINRT + PL + IN, +K^· A(I〇Ts ) - 1 log· log 1 〇(BWRU -NRU); Equation (23) where SINRT is the target SINR expressed in dB at the serving eNodeB 30. PL is the path loss from the serving eN〇deB 30 to the WTRU 20 in dB, including shadow fading, where the WTRU 20 measures path loss based on DL RS, and the WTRU 20 knows DL RS via DL Layer 2/Layer 3 signaling. The transmission power, IN〇, is the UL interference and noise power expressed in dBm, which is measured at the serving eNodeB 30. κ is the power control boundary set by the serving eNodeB 30. Preferably, the target SINR of the WTRU 20 (or a sub-group of WTRUs) is adjusted according to the link quality metric (e.g., BLER) at the serving eNodeB 30 using the outer loop PC scheme. In addition, in the case of UL Multiple Input Multiple Output (ΜΙΜΟ), the target SINR also depends on the selected VQM〇 mode, which takes into account that different chirp modes require different SINRs for a given link quality. Δ(9) 71') represents the UL load control step size, which is a function of the UL interference load (e.g., thermal interference) indicator / 〇rs of the strongest neighboring cell, where the strongest neighboring cell is based on a single neighbor from the WTRU 20 The path loss measurement of the cell to the WTRU 20 is determined. It is assumed that each cell periodically broadcasts UL interference payload bits (similar to relative grants in HSUPA) so that WTRU 20 can decode the indication bits from the selected strongest neighbor cell. For example, △(/%) can be calculated as follows: Δ(/ο7,)=| 0<0, when 7's = 1 or """ command 5 corpse 1〇, when /% = 0,,, Naihan ,, or is the "up command" where δ is a predefined system parameter, for example, δ = -1 or -2 dB. By using Δ (IoTs), inter-cell interference in adjacent cells can be mitigated. Since the WTRU at the cell center has less interference with other cells than the WTRU at the cell edge, the segmentation of the load control step is considered as follows: δ = · δ, δ For small cell edge WTRUs for small cells An internal WTRU where x > 1 WTRU 20 may determine, for example, whether it is located at the cell edge or within the cell based on the path loss ratio between its serving cell and the strongest neighbor cell. If (Path Loss_Service _ cell-path loss_strongest_adjacent-cell)<R (book)' x=4; where R represents the virtual edge 22 between the inner region of the cell and the edge region of the cell. 201215006 boundary layer. R can be broadcast semi-statically by the eNodeB 30. After the initial transmission phase, the WTRU 20 PSDTX is calculated as follows:

PSDTx = SINRT + PL + INQ + K + A: (I〇Ts) + a. f (PQI, SINRT) — \0•'[oglQQBWRu .NR(J where (24) where f (CQI ' SINRT) is based The correction factor of the UL CQI and the corresponding target SINR, where the serving eNodeB 30 signals the CQI and the target SINR; «, here, is the weighting factor determined according to channel conditions and cqi availability (or UL transmission interruption). For example, in In the case where there is no scheduled UL data transmission and no UL CQI (UL MCS or Authorization Information) from eN〇deB 30 is available, the weighting factor α is set to 〇, indicating that the WTRU 20 only relies on the open loop pc (for example, On a random access channel (RACH) PC); otherwise, it is set to be less than or equal to 丨〇). A correction factor f (CQI, SINRT) in equation (24) for compensating for an open-loop PC-related error, including path loss measurement errors due to incomplete reciprocity between see and DL in FDD WTRU 2 〇 transmitter impairment due to non-linear amplification of WTRU transmitter power. In addition, the correction factor is used to compensate for target quality mismatch due to different channel conditions. Thus, the quality of the power controlled channel is maintained along with the given target quality (e.g., target SINR). Considering that UL CQI (UL MCS or Authorization Information) indicates the SINR received at eN〇deB 30, the correction factor can be calculated as follows, f(CQI, S!NRT) = SINRr - E {SlNResl(CQI)} (dB); Equation (25) where ·U(10) represents the SINR estimate received by the eNodeB, and the WTRU derives the value from the UL CQI feedback. The representative estimates that the average of the time is 23 201215006’

Shen V吟 and body, two: Foreign and Qing, where C0/* indicates that the third is the illusion (26) k received CQW is the average (four) wave coefficient, ί, η on „target _ and estimated S ancestors (from the report The correction factor in equation (25) given by the difference of (7)1 indicates the open-loop pc correlation error that needs to be compensated. The transmission power of the two remedies should be the maximum power value max and the sum respectively expressed in rice. Between the small power values Pmin, where the maximum and most based on the WTRU level is determined. The ten-resistance preferably eN〇deB 30 signaling parameters, including the target SINR value SINRT, which is a SINRT WTRU (or subgroup of the WTRU) specific parameters Here, the target SIR can be adjusted by an outer loop mechanism based on Q〇s such as the target BLER. The target SINR can also be a function of path loss measurement. In the adjustment, the signaling of the target SIR is via the in-band L1/2 control signal. The power control boundary κ, which is a dedicated parameter of the eNodeB, can also be signaled by %. K is preferably semi-static and signals via the broadcast channel (BCH). It should be noted that even if κ is used separately with other parameters The way to send a signal, it also To be embedded in the target SINR, that is, SINRT (after embedding) = SINRt + k (dB). In this case, the WTRU 20 does not require explicit signaling of κ. The eNodeB 30 also signals the total The UL interference and noise values, ΙΝ0, are averaged over all used subcarriers (or rb) or subsets of subcarriers 24 201215006. This parameter is preferably obtained by the serving eNodeB 30 (and possibly via the BCH). The update rate of this signaling is typically relatively slow. The maximum and minimum UL power values Pmax and Pmin are also signaled by the eNodeB 30. Each of them may be a WTRU performance dependent parameter or may be explicitly signaled by the eNodeB 30. UL channel quality indicator CQI (eg UL MCS or Authorization Information), which is initially signaled for UL AMC (with a maximum signaling rate per TTI, eg ι000 Ηζ). eNodeB CQi mapping for CQI feedback generation Rule (or offset between CQI and measured SINR). This rule or parameter can be combined into a target SINR. In this case, no display of rules (or parameters) is required. The UL interference load indicator from each eNodeB. The semi-static parameter R represents the virtual boundary layer between the inner region of the cell and the boundary region of the cell. The disclosed PC method does not require the system parameters listed above. This includes the target SINK, the cell-sponsoring/_leaf- _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ In order to meet the county of TRA, it is designed to be adapted and adapted to the motion = / / link parameters (target slug and inter-cell interference load and channel conditions (path loss and shadow fading). _ 妓 妓 料 和 和 和 和 和 和 和 和 和 和 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 The serving eNodeB 30 can adjust the inter-cell interference value with the $42, thereby merging the target arc, power: control boundary K, or comma p_. - Used to control the wireless transmit receive unit (WTRU) 63⁄4 method of transmitting power, the method comprising: riding a ±(10) way (UL) power control (PC) component based on path loss f; determining a closed loop power control component including a correction factor; and combining an open loop component and a closed loop component In combination with the power offset to determine the transmission power. 2. The method of embodiment 1, the method further comprising: receiving a PC correction command, a correction factor based on the correction command, or a cumulative correction command. 2 stated The method, wherein the pC correction command is received within a pre-configured signaling time. The method of embodiment 3, wherein the pre-configured signaling time is in a particular UL grant. The method according to embodiment 4 The ul authorization is a hybrid access repeat request (HARQ) process. The method of any one of embodiments 2-5, wherein the open loop PC component is based on a path loss variation.

J. The method of embodiment 6, wherein the path loss variation 26 201215006 8. 9. 10. 11. 12. 13. 14. is the path loss before discontinuous transmission and the time before recovery sees transmission The change between the path losses. The method of any of embodiments 2-7, wherein the PC correction command uses a plurality of command bits determined based on link quality. The method of any one of embodiments 1-8 wherein the correction factor is determined using the following equation:

Ad〇sed = [ESINResl - SINRlargei \ . wherein the orphan/tear & „ and represents the effective signal interference (ESINR) and the target SINR. The method according to any one of embodiments 2-9, the method further comprising The method for calculating the correction command according to any one of embodiments 1-10, wherein the method further comprises: applying the transmission power to a next uplink transmission time interval ( The method of any one of embodiments M1, wherein the correction factor is zero (〇) in the initial uplink transmission according to any of the embodiments M2. The method of one embodiment, wherein the correction factor is an uplink grant assignment. The method of embodiment 13 wherein the authorization based correction factor is determined using the following equation: f (UL grant assignment, SINRr) = SINR, ~ E {SINR^ (UL grant assignment)} 27 201215006 where 抓 胸 __6. 〇 indicates the sinr estimate received by the WTRU from the eNodeB obtained from the authorization allocation. I5. The method of embodiment, the method further comprising determining whether to use the authorization-based correction factor based on the received correction factor flag. 16. The method of embodiment, the method further comprising determining whether to use the authorization-based correction factor based on the received MCS mismatch indicator. The method of _real_14, wherein the method further determines whether to use an explicit correction command based on the MCS system. The method of any one of embodiments 1-17, further comprising determining an interference chirp indicator, the pin disturbance load indicator being determined from the strongest neighboring cell. The method of embodiment 18, wherein the transmission power is based on a downlink reference signal, the interference load indicator being used to mitigate inter-cell interference. A wireless transmit/receive unit (WTRU) that includes a processor configured to perform the method as described in any of the embodiments of M9. 2L - Node B' The Node B includes a processor configured to perform the method as described in any of embodiments 1-19. Although the features and elements of the present invention have been described above in the preferred embodiments, the specific features and elements may be in the preferred embodiment described in the no. Used alone, or in various situations combined with or mixed with the hair. The method of the present invention can be implemented in an electric job type or a miscellaneous money executed by a computer or a processor, and the light, soft or f-send of the towel is in the shape of a british brain-readable storage body. , computer-readable storage, the real read-only memory (face), the memory (RAM), the scratchpad, the buffer memory, the semiconductor memory county, the internal hard county can be magnetic The body of the class, the magneto-optical Μ妓 CD, first made her a piece of optical media like the township (1). . For example, 'appropriate processing includes: general purpose processor, dedicated processing 1 §, conventional processor, digital signal processing p (DSp), multiple microprocessors, one or more microprocessors associated with the DSP core Controlling crying, microcontrollers, specific Wei Lai circuits (ASICs), field programmable two-column (FPGA) circuits, any type of road and/or state machine. A software-related processor can be used to implement a radio frequency transceiver for a wireless transmit WTRU, a UE, a terminal, a base station, a radio network controller (RNC), or any host Look at the computer. WTRU can be implemented in hardware and / or video format = module combination, such as camera, video camera, video phone, speaker phone, vibration device, speaker, microphone, TV transceiver, hands-free headset, keyboard , Bluetooth® module, FM radio unit, liquid crystal display H (LCD) display unit, organic light-emitting diode (〇led) display single it, digital sound_discharger, old age, electric game machine model 29 201215006 Group, Internet browser and / or any wireless local area network (WLAN) module or ultra-wideband (UWB) module. 201215006 [Simplified Description of the Drawings] 'By giving a more succinct understanding of the present invention, which can be understood from the following description of the preferred embodiments, which are understood by way of example, in which: 1 is an exemplary wireless communication system; transmission of a system (PC) method. FIG. 2 is an exemplary block diagram of a power controller and receiver configured to implement the disclosure; FIG. 3 is a diagram showing the disclosed combined PC method timing. Example of FIG. 4 shows an example of a combined power control method disclosed when the interval TTI ( ) is 丨 (1); FIG. 5 shows another one of the combined pc timings disclosed when the interval TTI is 2 (7) Example; FIG. 6 shows an example of a disclosed scheme including a discontinuous transmission (dtx) combination; FIG. 7 shows an example of a disclosed pc method for an nth update moment; and FIG. 8 shows The disclosed combined open loop and closed loop methods are used to determine the flow chart for the Tpc. [Main component symbol description] 10 Wireless communication network (NW) 20 Wireless transmitting/receiving unit (WTRU) 30 Node B 40 Cell 110, 120 Transceiver 31 201215006 115, 125 Processor 116, 126 Receiver 117, 127 Transmitter 118, 128 antenna 32

Claims (1)

201215006 VII. Patent Application Range: 1. Apparatus for controlling transmission power of a wireless transmit receive unit (WTRU) 'The apparatus includes: receiving a reference symbol; determining a path loss based at least in part on the received reference symbol; Determining an open-loop uplink (PC) component based on the path loss measurement; determining a closed-loop Pc component including a correction factor; and shifting the open-loop rc component and the _Pc component-- The value-dependent - Δ factor is combined with the _ fixed-hetery power, and the 愧 offset value is -__ in the modulation and coding scheme (MCS), 2. according to the method described in the application, The reference symbol is received from the serving cell of the WTRU. 〜 3. According to the method described in the above, the method further includes: receiving a PC correction command, wherein the correction factor is The method of claim 3, wherein the pc correction command is received within a pre-configured signaling time, according to the method of claim 3, wherein the pc correction command is received within a pre-configured signaling time. The financial law, The pre-configured #々 time is in a specific UL grant. 6. The method of claim 5, wherein the sink is related to a Hear Access Repetition Request (HARQ) process. The method of claim 3, wherein the open loop 跎33 201215006 component is based on a path loss variation. 8. According to the patent application, the change is based on the on-discontinuous transmission (DTX). 9. Before the transmission, the time between the loss and the loss is 9. The method described in the third item of the patent, the i(4) command includes a plurality of command bits determined based on the link quality. Further ίο. A unit (WTRU), the wtru includes a receiver configured to reference a reference symbol; a processor configured to determine at least a portion of the reference symbol to determine a path loss measurement; Determining an open loop uplink (UL) power control (pc) component based on the path loss measurement; the processor is further configured to determine a closed rate control component including a correction factor; and & Configured to Combining the open-loop PC component and the closed-loop pc score with a delta factor associated with the offset value to determine an itru transmission power, wherein the offset value is a change in a modulation and coding scheme (MCS) Related. 11. The WTRU as recited in claim 1, wherein the reference symbol is received from a serving cell of the WTRU. 12. The WTRU of claim 1, wherein the WTRU further comprises: a receiver configured to receive a PC correction command, wherein the correction 34 201215006 13. 14. 15. 16. 17. The Pc correction command or a cumulative correction command is based. The WTRU of claim 12, wherein the PC correction command is received within a pre-configured signaling time. The WTRU of claim 13 wherein the pre-configured signaling time is in a particular UL grant. The WTRU of claim 14 wherein the UL grant is associated with a hybrid access repeat request (HARQ) process. The WTRU according to claim 12, wherein the open loop PC component is based on a path loss variation. The WTRU according to claim 16 wherein the path loss variation is based on a path between a discontinuous transmission (DTX) and a path loss before recovering a UL transmission. Determined by change. 35